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CPAP clock drift enhancement for OSCAR (multiple time-dependent corrections)
#11
RE: CPAP clock drift enhancement for OSCAR (multiple time-dependent corrections)
(01-12-2021, 11:53 AM)tungpust Wrote: @sawinglogz

Glad to hear clock drift enhancements are on the radar. Not sure I would want to enter a new clock drift correction every time I do a flash card dump, though. Just a per-profile set  of voluntary occasional  corrections would work best for me (just as described in OP)
...
I imagine for some machines with wifi, the machine clock can be possibly be queried or otherwise observed during download, and compared with computer network walltime. This would be a more automated approach that could easily be done along with each download. But for those of us that hand-carry the card to a computer for download, not having to enter a correction each time is essential.

You're exactly right. The idea would be to expand the underlying data structures for *allow* for a time correction at each import, but not require it.

When OSCAR can connect to a device and determine the clock skew, it can (eventually) automatically record such a correction. When you bother to write a correction down, OSCAR could (eventually) let you record it for that session, and interpolate (if desired) between this correction and the last correction you entered for all intervening sessions.

And following on what Arie said, we want to make it easy to enter an adjustment during the import as well as afterwards, when looking at the data.

As a fun data point: I had left my SleepU in a drawer for about a month. I used it without syncing to my phone. Then when I imported I discovered its clock had drifted by about 7 minutes! I sure wish I could tell OSCAR to adjust the oximetry timestamp for that one session...
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#12
RE: CPAP clock drift enhancement for OSCAR (multiple time-dependent corrections)
(01-12-2021, 01:24 PM)sawinglogz Wrote:
(01-12-2021, 10:32 AM)A KLERK Wrote: Isn't there a way to trigger all machines for synchronization? I try a cough plus movement...
Think of the motion clap board (right name?) used for the same purpose in movie industry...

But even armed with that knowledge, OSCAR doesn't make it easy for you to correct the relative timestamps for that night.

... not yet, I bet!
And, everything should be related to the PC-clock, which is the only accurate reference.
Arie KLERK: Member of the Dutch Apnea Association staff (https://apneuvereniging.nl) and proud to be Translations Team Coordinator for OSCAR. 
***Please help: Looking for MORE translators and editors***

Membership in the Advisory Members group does not imply medical expertise or qualification for advising Sleep Apnea patients, but just dedication to AB. 
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#13
RE: CPAP clock drift enhancement for OSCAR (multiple time-dependent corrections)
(01-12-2021, 10:32 AM)A KLERK Wrote: Isn't there a way to trigger all machines for synchronization? I try a cough plus movement...
Think of the motion clap board (right name?) used for the same purpose in movie industry...

I do use attempts to simultaneously do sharp inhalations as I abruptly do jerks upward with the accelerometer before "wearing" (affixing) it. The sigh and the coincident slight motion is far more accurate.  Startup delays in logging, as well as reaction time variations, come in to play. It occurs to me now to try not starting the oximeter until lying down and ready to sleep. Turn it on as simultaneously as possible with start of a large leak by lifting the mask. There will still be a logging start up lag for SpO2 data, but more nearly constant.
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